Rate my Gen 7 Battle Stadium Singles team

Question

This is one of my first teams. It's weird.

Sableye @ Life Orb
Ability: Prankster
EVs: 252 Def / 252 SpD / 4 SpA
Quiet Nature
- Toxic
- Taunt
- Shadow Ball
- Moonlight

Toxic is to put the opponent on a timer or to force them to switch. Taunt is anti-setup sweeper. Shadow Ball is STAB and Life Orb boosted. Moonlight is for recovery.

Metagross @ Metagrossite
Ability: Clear Body
EVs: 252 HP / 252 SpD / 4 Atk
Brave Nature
- Meteor Mash
- Earthquake
- Explosion
- Rock Slide

Meteor Mash is STAB. Earthquake is Earthquake. Explosion is for getting rid of tough opponents that would 2HKO it anyway (Garchomp) and Rock Slide is for coverage and speed drops.

Chansey @ Eviolite
Ability: Serene Grace
EVs: 252 Def / 252 SpA / 4 HP
IVs 31 Def
Bold Nature
- Ice Beam
- Calm Mind
- Thunderbolt
- Hyper Beam

Thunderbolt and Ice Beam are for coverage and status effects. Hyper Beam is STAB and Calm Mind is to power up moves.

Garchomp @ Garchompite
Ability: Rough Skin
EVs: 252 Atk / 252 Spe / 4 SpA
Naive Nature
- Earthquake
- Stone Edge
- Outrage
- Swords Dance

This set is obvious. 3 Swords Dances then a clean sweep.

Alolan Marowak @ Sitrus Berry
Ability: Lightning Rod
EVs 252 Atk / 252 Def / 4 HP
Relaxed Nature
- Shadow Bone
- Flare Blitz
- Aerial Ace
- Iron Head

This is a physical moveset designed for strong STAB and coverage moves.

Togekiss @ King's Rock
Ability: Serene Grace
EVs: 252 SpA / 252 Spe / 4 SpD
Modest Nature
- Dazzling Gleam
- Shadow Ball
- Flamethrower
- Ancient Power

This is a special set that relies heavily on Serene Grace. Ancient Power is now much more likely to give the boost.

Comments

You need to know the battle format you're playing in order to post here. In general, you should choose the battle format you're playing before you make a team (as doing so the other way around is like going in blind).
More detail on how to choose a battle format and why we enforce this is available here: https://pokemondb.net/pokebase/meta/76386#a76464

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Battle Stadium Singles

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OK, good enough. I added that to the post.

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How do you plan to use two Megas?

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BSS is 3v3 so you're not committed to using both mega stones. Still not a great team though, might as well talk about it:
* It matches poorly against important threats. Mimikyu, Salamence, etc. can do what they like, especially considering Sableye does not have Will-o-wisp.
* Mega Garchomp is worse than Dragonium Z Garchomp, which is faster. Garchomp in general has really obvious counterplay -- not great that it's the team's only wincon.
* The Chansey set is really awful. The opponent would need to be absolutely incompetent to allow a mon with base 35 SpA and 50 Spe to do any damage. Luck mechanics in general aren't very good (and this team somehow manages not to have the best luck abuser in Air Slash Togekiss).
* Coverage does not mean covering all your defensive weaknesses, especially not with weak attacks like Aerial Ace and Rock Slide. Focus on maximising offensive coverage.
* Other odd choices like Life Orb Sableye and Marowak without Thick Club (or TR).